Probably because its cooler in deeper water, kind of like the deep end of the pool is cooler that the kiddie pool.
a rock pool is deeper when the tide is in
The "T" at each end of the lane in a competetive pool is to warn the swimmer of the aproach of the turn.
An Olympic sized pool is 50m
Neither. Say, "25 metre pool".
the 1st olympic swimming pool was in 1899.
A semi-olympic pool is 25 meters long by 12.5 meters wide with a depth of between 1.2 and 1.6 meters.
One is bigger than the other
The temperature of an olympic pool is kept at 25-28C (77-82F)
Still used as an Olympic pool for practice and events.
50 Meters, standard Olympic Sized pool.
There are usually 50 meters in a Olympic sized swimming pool.